8.5 cm Septarian with Xipheroceras and others, from Charmouth, Jurassic coast

A beach worn pebble measuring 8.5 cm across filled with Xipheroceras, Promicroceras and Cymbites ammonites.
 
No repairs or restoration, 
The piece originates from the Stellare Septarian nodule bed. 
 
Lower Sinemurian, Black Ven Mudstone Member, Charmouth Mudstone Formation, Charmouth, Dorset. 195 MYA